Pulp screen



J. H. BAKER.

PULP SCREEN. APPLICATION FILED NOV-15,1919.

Patented Jan. 24, 1922.

4 SHEETS-SHEET l.

3 vwe ntoz Jamar/Y Baker ///5 a ltmmeqd J. H. BAKER. I

PULP SCREEN. I APPLICATION FILED NOV- 15. 1919.

Patented Jan. 24, 1922.

3 Wm: mto'p J. H. BAKER.

PULP SCREEN.

APPLICATVION FILED NOV. 15. m9.

1 #104,566, Patented Jan. 24, 1922.

4 SHEETSSHEET 3- I El vwento'a Lfamar E fill/2791 J. H. BAKER.

PULP SCREEN.

APPLICATION FILED NOV. 15. 1919.

1 ,404,566, Patenied Jan. 24, 1922.

4 SHEETS-SHEET 4.

3 vwcmto'a UNITED STATES PATENT OFFICE.

PULP SCREEN.

Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed November 15, 1919. Serial No. 338,165;

T 0 all whom it may concern:

Be it known that 1, JAMES H. BAKER, a citizen of the United States,residing at Saratoga Springs, in the county of Saratoga and State of NewYork, have invented an Improvement in Pulp Screens, of which thefollowing is a specification.

This invention relates to a machine for screening wood pulp stock forthe manufacture of paper. Heretofore Various forms of pulp screens havebeen employed, and in some instances apparatus for screening paper pulpstock have included series of screens together with means for agitatingthe same. In other instances, the stock is conveyed to a screen drum orbarrel and forced through the same by different forms of centrifugaldevices, while in still other types of this form of apparatus, the pulpstock is conveyed to a receptacle containing a screen and is forcedthrough the same by suitable diaphragms. The present invention relatesto the latter type of apparatus and in carrying out the same, I employ asuitable vat or receptacle in which there is mounted a drum or screenbarrel; I also employ series of circumferentially disposed diaphragmsplaced around the periphery of the screen drum, together with means forrevolving the drum and simultaneously actuating the diaphragms to forcethe stock against the screen drum causing the finer portions thereof topass through the slots or meshes of the drum to the interior thereof.The apparatus also includes means for admitting the stock to the vat orreceptacle, means for conveying the screened stock from the apparatus,and also devices for clearing the surfaces of the screen drum from thoseportions of the stock which do not pass through the screen drum andconveying the same to a suitable place of deposit. Furthermore, incarrying out the invention, the diaphragms are each preferably providedwith valves of suitable type to decrease the resistance of the same whenmoving from the screen drum while at the same time closing the valveopenings when the diaphragms are moved toward the screen drum so thateach diaphragm presents a continuous surface to force the pulp stockthrough the meshes of the screen drum, as will be hereinafter moreparticularly described.

In the drawing:

Fig. 1 is an end elevation and partial cross section of the pulp screenmade in accord ance with this invention.

Fig. 2 is a similar view taken from the op posite end of the apparatus.

Fig. 3 is a partial front elevation and cross section illustrating myimproved pulp screen, and

Fig. i is a plan and partial cross section of the same.

Referring to the drawing, it Will be seen that in carrying out thisinvention, the apparatus comprising the same includes a base 10, uponwhich in a suitable position bearing blocks 11 are mounted. In thebearing blocks 11, a shaft 12 is journaled, and on the shaft 12 a drivepulley 13 is suitably secured. On the base 10, there is also mounted avat or receptacle comprising a trough member 14 to which the ends 15 ofthe vat are secured in any suitable manner. Vithin the receptacle thereis mounted a screen drum or cylinder 16, the shaft of which is journaledin suitable bearings 17, and in the periphery of which there is suitablysecured series of screen plates 18. These screen plates, as will beunderstood, may be made in any suitable manner with slots of requireddimensions or of material of any suitable mesh to meet the requirementsof the apparatus.

On'the shaft 12, there is a beveled gear 19 meshing with a beveled gear20 secured on a shaft 22, the shaft and the gears being enclosed in asuitable casing 21. On the shaft 22 there is a worm 23 meshing with aworm gear 2 1- on the shaft of the screen drum, and the worm and wormgear are inclosed in a suitable casing 25. As will now be understood,the screen drum is revolved from the pulley on the drive shaft 12through the worm gear 24, the worm 23, the shaft 22 and the beveledgears 19 and 20.

- On the drive shaft 12, I also employ an eccentric 26 fitted with aneccentric strap 27 to which is connected an eccentric rod 28. The head29 of the eccentric rod is mounted on a screw spindle 30 suitablysecured in a lever 31. This lever 31 at the lower end thereof is pivotedin a bracket provided therefor in the base of the apparatus as indicatedat 32, and at its upper end the lever 31 provided with a cap 33 throughwhich the screw spindle 30 passes and is swiveled so as to turn therein,and by turnlng to raise and ally connected as indicated at 36 to a link37 mounted on a shaft 38 which is journaled in suitable bearingsindicated at 39. On the other side of the lever3l, there is also a rod49 which like the rod 34 is pivoted at one end as indicated at 41 in aboss provided therefor on the lever 31, while at its other end, the rod40 is pivotally connected as indicated at'42-to a link 43 secured on ashaft 44 which is journaled in bearings indicated at 45. On the shaft 38there are cams 37, and on the shaft 44 there are similar cams 43.

A link 46 is pivotally connected at one end as indicated at 47 to a cam43 and extends'through an opening provided therefor in the base of theapparatus, and at its op-' posite end is pivotally connected asindicated at 48 toone end of a lever 49; The opposite end of the lever49 is pivotally connected to a bracket 50 as indicated at 51, andapproximately centrally thereof, the lever49 is provided with a pivotpin 52.

On the exterior of the vat or receptacle, 1

i employ series-of arms for actuating the diawill be understood, anydesired number of phra'gms which are contained within the receptacle. Inthe drawing, 1 have illustrated a pair of arms at the front and also apair of arms at the rear of the apparatus, but as these arms may beemployed as may be necessary, and as these arms and then connectlonswith the diaphragms are the same,

but one of them will be specifically described.

One of these arms is indicated at 53. At its upper end, the arm 53 isfitted with a link 54. The link'54 is pivotally connected to a bracketas indicated at 55 and is also pivotally connected to the upper end ofthe arms as indicated at 56. At the lower end of the arm 53, the same isprovided with an aperture 57 through which a rod or bolt 58 passes andaround which exteriorly of the lower end of the arm there is a spring59, the spring 59 extending between the outer surface of the lower endof the arm and a handle 60 by which the tension of the spring may beadjusted, as will be readily understood, to maintain the lower end ofthe arm in contact with the face of the cam 43. As illustrated, the arm53 is angular and at the angle thereof there is connected a diaphragmrod 61. At one end this diaphragm rod is connected in a yoke bracketwhichis pivotally connected to the angular portion of the arm 53 asindicatedat 62; The diaphragm rod 61 is journaled in a bearing 63forming part of a bracket 64 which may be suitably connected by bolts orotherwise to the frame of, the apparatus, with the diaphragm rod passingthrough the same. Connected to the diaphragm rod'in any suitable manner,and also secured between the frame and the bracket 64, there'is ayielding diaphragm 65 madeof rubber or anyother suitable material so asto make a tight joint and at the same time permit the diaphragm rod toreciprocate in order to actuate the diaphragm which is connectedthereto. At the inner end ofthe diaphragm rod there is a head 66 securedthereto, and suitably connected to the head 66 is a diaphragm 67.

The diaphragm 67 is made on the arc of a circle to conform to theperiphery of the screen drum 16, and in suitable positions in thediaphragm 67 there are flapvalves 68 connected thereto by rivets 69 orotherwise. These flap valves, as will be understood, normally cover theports in the diaphragm when the diaphragms are moved toward thescreenidrum, but'will permit the stock contained in the vat orreceptacle to pass through the openings in the diaphragm so as torelieve the pressure of the diaphragm in the movements of the same awayfrom the screen drum.

One of the rods of the opposite side of the apparatus is indicated at70, and this is connected to a diaphragm 71 placed in the positionopposite the diaphragm 67, while in the lower part ofthe vat, there is adiaphragm 74 connected to a rod 7 3 which at its outer end is connectedto a yoke 72' pivota'lly secured to the lever 49 by the pivot pin 52. c,r

The apparatus is provided in a suitable position with an inlet 75 forthe pulp stock to be screened and at the opposite side of the apparatuswith a drain 76'which may be opened to draw out that part of the stockwhich does not pass through the screen drum and which is not clearedtherefrom by the shower as hereinafter described. The apparatus alsoincludes a shower inlet 77 connecting witha suitable shower 78 placedinteriorly of the screen drum, and also with a waste trough 7 9connected with'the sliver outlet 80 as well as with an outlet connecdiaPhragmsGT and 71, the lower frame T4 being actuated from the rockershaft 38 by the link 46 and the lever 49, together with the connectionsbetween the lever 49 and this lower diaphragm as hereinbetore described.Now as will be understood, when the diaphragms approach the screen drum,they force the stock through the recesses or meshes therein and in doingso, present a continuous surface to the stock, while in moving in theopposite direction, the stock is permitted to pass through the ports inthe diaphragms by means of the yielding flap valves employed. Also asthe screen drum revolves, each section of the screen is cleared orcleaned of the slivers or parts which do not pass through the screen bythe shower and conveyed thereby to the waste trough 7 9 and thence tothe sliver outlet and to any suitable receptacle and the screened stockpasses from the interior of the screen drum by way of the outlet 81 to aplace for use or to a suitable receptacle in which the same is stored.

I claim as my invention:

1. A pulp screen comprising a pulp stock receptacle, a screen therein, adiaphragm also within the receptacle and between the walls of the sameand the said screen, a rod extending through the walls of the receptacleand upon which the said diaphragm is mounted, a yielding diaphragmmaking a tight joint for the rod, and means exterior of the receptaclefor actuating the said rod to impart a reciprocating movement to thesaid diaphragm.

2. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, a diaphragm also within the receptacle and between the walls ofthe same and the said screen, means for moving the diaphragm toward andaway from the said screen, and devices in the diaphragm permitting thepulp stock to pass through ports therein when the diaphragm is movedaway from the screen.

3. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, a diaphragm also within the receptacle and be tween the wallsof the same and the said screen, means for moving the diaphragm towardand away from the said screen, the said diaphragm having ports therein,and valves covering and closing said ports when the diaphragm is movedtoward the screen and opening to permit the pulp stock to pass throughthe said ports when the diaphragm is moved away from the screen.

4. A pulp screen comprising a base, a pulp stock receptacle. a screentherein, a diaphragm also within the receptacle between the wallsthereof and the said screen, a swinging arm mounted and lying exteriorlyof the receptacle, a rod connected to the swinging arm passing throughthe walls of the receptacle and carrying the said diaphragm therein, andmeans for actuating the said swinging arm to reciprocate the diaphragm,causing the same to move toward and away from the said screen.

pulp screen comprising a base, a pulp stock receptacle, a screentherein, a diaphragm also within the receptacle between the wallsthereof and the said screen, a. swinging arm mounted and lyingexteriorly of the receptacle, a rod connected to the swinging armpassing through the walls of the receptacle and carrying the saiddiaphragm therein, means for actuating the said swinging arm toreciprocate the diaphragm, causing the same to move toward and away fromthe said screen, and means for varying the extent of motion given to thesaid swinging arm so as to vary the extent of the travel of the saiddiaphragm,

6. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, a diaphragm also within the receptacle between the wallsthereof and the said screen, a swinging arm mounted and lying exteriorlyof the receptacle, a rod connected to the winging arm passing throughthe walls of the receptacle and carrying the said diaphragm therein, alever mounted to rock on the said base, a cam for moving the saidswinging arm, a link connecting the said lever and cam, and means forimparting a swinging movement to the said lever.

7. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, a diaphragm also within the receptacle between the wallsthereof and the said screen, a swinging arm mounted and lying exteriorlyof the receptacle, a rod connected to the swinging arm passing throughthe walls of the receptacle and carrying the said diaphragm therein, alever mounted to rock on the said base, a cam for moving the saidwinging arm, a link connecting the said lever and cam, means forimparting a swinging movement to the said lever, and devices for varyingthe extent of the swinging movement imparted to the said lever.

8. A pulp screen comprising a base. a pulp stock receptacle, a screentherein, a plurality of diaphragms also within the said receptacle andbetween the walls thereof and the said screen, swinging arms mounted andlying on the exterior of the receptacle, connections between the saidswinging arms and the said diaphragms, and mean for actuating the saidswinging arms to impart a reciprocating motion to the said diaphragms tomove the same toward and away from the said screen.

9. A pulp screen comprising a base, a pulp tock receptacle, a screentherein, a plu rality of diaphragms also within the said receptacle andbetween the walls thereof and the said screen, swinging arms mounted andlying on the exterior of the receptacle, connections between the saidswinging arms and the said diaphragms, means for actuating the saidswinging arms to impart a reciprocating motion to the said diaphragms to'move the same toward and away from the said screen, and devices foradjusting the extent of the movement of the swinging arms to vary theextent of the travel of the diaphragms.

10. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, oppositely disposed diaphragms at the sides of the said screenand between the same and the walls of the receptacle, a diaphragmintermediate of the aforesaid diaphragms at the bottom of the receptacleand between the walls thereof and the said screen, and means forsimultaneously actuating the said diaphragms to cause the same to movetoward and away from the said screen.

11. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, oppositely disposed diaphragms at the sides of the said screenand between the same and the walls of the receptacle, a diaphragmintermediate of the aforesaid diaphragms at the bottom of the receptacleand between the walls thereof and the said screen, means for actuatingthe said oppositely disposed diaphragms to move the same toward and awayfrom the said screen, and devices actuating by tlieaforesaid means foroperating the intermediate diaphragm to cause the same to move towardand away from the said screen. v

12. A pulp screen comprising a base, a pulp stock'receptacle, a screentherein, oppositely disposed diaphragms at the sides of the said screenand between the same and the walls of the receptacle, a diaphragmintermediate of the aforesaid diaphragms at the bottom of the receptacleand bet-ween the walls thereof and the said screen, a series of-armsmounted on the exterior of the receptacle so as to swing thereon,connections between the said arms and the said oppositely disposeddiaphragms, means for simultaneously actuating said arms to operate thesaid oppositely disposed diaphragms, and devices actuated by theaforesaid means for operating the said intermediate diaphragm. I

13. A pulp screen comprising a base, a pulp stock receptacle, ascreentherein, oppositely disposed diaphragms'at' the sides of the said screenand between the same and the walls of the receptacle, a diaphragmintermediate of the aforesaid diaphragms at the bottom. of thereceptacle andbe'tween the walls thereof and the said screen, a seriesof arms mounted on the exterior of the receptacle so as to swingthereon, connections between the said arms and the said oppositelydisposed diaphragms, means for simultaneously actuating said arms tooperate the said oppositely disposed diaphragms, devices actuated by theaforesaid means for operating the said intermediate diaphragm, and meansfor varying the extent of the travel of the said diaphragms,

14:. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, oppositely disposed diaphragms at the sides of the saidscreenand between the same and the walls of the receptacle, a diaphragmintermediate of the aforesaid diaphragms at the bottom of the receptacleand between the walls thereof and the said screen, a series of armsmounted on the exterior of there-c ceptacle so as to swing thereon,connections between the said arms and the said oppositely disposeddiaphragms,a rocking lever,

means'for actuating the same, cam members for operating the saidarms,'links connecting the said cam members with the said rocking leverto actuate the said arms and thereby impart a reciprocatlng movement tothe said op'posltely disposed diaphragms,

and means for operating the said intermediate diaphragm from one of thesaid cam members. i p 7 V 15. A pulp screen comprlsing a base, a

pulp stock receptacle, a screen therein, opdiaphragms at the sidespositely disposed of the said screen and between the same and the wallsof the receptacle, a diaphragm intermediate of, the aforesaid diaphragmsat the bottom olf the receptacle and between the walls thereof and thesaid screen, a series of arms mounted on the exterior of the receptacleso as to swing thereon, connections between the said arms and the saidoppositely disposed diaphragms, a rocking lever, means for actuating thesame, cam members for operating the said arms, links connecting the saidcam members with the said rocking lever to actuate the said arms andthereby impart a reciprocating movement to the said oppositely disposeddiaphragms, alever, a bracket in which the said lever is pivotallymounted at one end thereof, a link connecting the opposite end of thesaid lever with one of the said cam'members, and a connection betweenthe said lever and the said intermediate diaphragm for'operating thesame from the said cam member.

16. A pulp screen comprising a base, apulp stock receptacle, a screentherein, oppositely disposed diaphragms at the sides of the said thewallsof the receptacle, a diaphragm intermediate of the aforesaiddiaphragms at the bottom of the receptacle and between thewallsthereofand the said screen, a series of arms mounted on the exterior of vthereceptacle so as to swing thereon, connections between the said arms andthe said oppositely disposed 'diaphragms, a rocking lever, cam membersfor operating the said arms, links connecting the said cam members withscreen and between the same and the said rocking lever to actuate thesaid arms and thereby impart a reciprocating movement to the saidoppositely disposed diaphragms, a lever, a bracket in which the saidlever is pivotally mounted at one end thereof, a link connecting theopposite end of the said lever with one of the said cam members, aconnection betweenthe said lever and the said intermediate diaphragm foroperating the same from the said cam memher, and means for actuatingsaid rocking lever and varying the travel thereolf to correspondinglyvary the extent of the travel of the said diaphragms.

17. A pulp screen comprising a base, a pulp stock receptacle, a screentherein, oppositely disposed diaphragms within the receptacle andbetween the same and the said screen, an intermediate diaphragm alsowithin the said receptacle and between the same and the said screen,swinging arms pivotally connected to the receptacle at the exteriorthereof, connections between the said swinging arms and the saidoppositely disposed diaphragms, a drive shaft, a rocking lever, meansfor actuating the said rocking lever from the said drive shaft, cammembers, links connecting the said cam members to the said rocking leverfor operating the cam members to actuate the said swinging arms andthereby impart a reciprocating movement to the said oppositely disposeddlaphragms, a lever pivotally con nected in the bracket secured to thesaid base, a link connecting the said lever with one of the said cammembers, and a connection between the said lever and the intermediatediaphragm whereby the said intermediate diaphragm is actuated from thesaid cam member.

18. A pulp screen comprising a base, a pulp stock receptacle, acylindrical screen member therein, means for turning the cylindricalscreen member, oppositely disposed diaphragms also in the receptacle andbe tween the same and the said cylindrical screen, arms pivotallyconnected to the said receptacle the exterior thereof, connectionbetween the said arms and the said oppositely disposed diaphragms, adrive shaft, a rocking lever, a screw spindle mounted in the saidrocking lever, an eccentric on the said drive shaft, an eccentric rodconnecting the said eccentric with. a head adapted to move on the saidscrew spindle in the said rocking lever, cam members, and linksconnecting the said cam members with the said rocking lever foractuating the said arms and the said diaphragms and varying the extentof the movements thereof.

19. A pulp screen comprising a base, a pulp stock receptacle, acylindrical screen member therein, means for turning the cylindricalscreen member, oppositely disposed diaphragms also in the receptacle andbetween the same and the said cylindrical screen, an intermediatediaphragm' also within the said receptacle and between the walls thereofand the said screen, arms pivotally connected to the said receptacl atthe exterior thereof. connections between the said arms and the saidoppositely disposed diaphragms, a drive shaft, a rocking lever, a screwspindle mounted in the said rocking lever, an eccentric on the saiddrive shaft, an eccentric rod connecting the said eccentrio with aheadadapted to move on the said screw spindle in the said rocking lever, cammembers. links connectingthe said rocking lever and the said cammembers, a. lever pivotally mounted at one end in a bracket, a linkconnecting the opposite end of the said lever with one of the said cammembers, and a connection between the said lever and the saidintermediate diaphragm whereby the said diaphragms are moved toward andaway from the said screen and the extent of the travel thereof may bevaried.

20. A pulp screen comprising a base, a. pulp stock r ceptacle, a screen.therein, a diaphragm also within the said receptacle and between thesame and the said screen, a rod upon which the said diaphragm ismounted, extending through he wall of the said receptacle, a bearing forthe said rod, a yielding diaphragm making a tight joint for the saidrod, and means exterior of the receptacle for actuating the said rod toim part a reciprocating movement to the said diaphragm.

QLA pulp screen comprising a base, a pulp stock receptacle, a screenwithin the receptacle, a diaphragm also within the receptacle andbetween the walls thereof in the said screen, a. bracket having abearing therein scoured exteriorly of the receptacle, a rod journaled inthe said bearing, passing through an openin in. the walls of thereepi'acle and CO1 .ted to the sa d diaphragm to support bllS same, ayielc n phragm f or making a tight joint at the 1- where the said rodpasses through the opening in the wall of the receptacle, and means -[oractuating the said rod to impart a. reciprocating motion thereto to movethe said diaphragm to and away from the said screen.

Signed by me this 31st day of October, 1919.

JAMES H. BAKER.

